用西林电桥测量介质损耗角正切的影响因素有(    )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69526' and id < 4504683 and id<>'4504683' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69526' and id > 4504683 and id<>'4504683' order by id asc limit 5